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Sulfur-containing natural gas hydrate inhibitor

A hydrate inhibitor and natural gas technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve problems such as hydrate blockage, and achieve good inhibition effect

Active Publication Date: 2013-10-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a natural gas hydrate inhibitor suitable for preventing hydrate formation in high-sulfur gas wells with high salt content in high-temperature water and gas production and transmission pipelines, which can prevent the development of high-sulfur gas wells due to throttling and depressurization. The problem of hydrate blockage in the process

Method used

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  • Sulfur-containing natural gas hydrate inhibitor
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  • Sulfur-containing natural gas hydrate inhibitor

Examples

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Effect test

Embodiment 1

[0022] The selected sulfur-containing natural gas hydrate inhibitor is composed of: kinetic inhibitor (binary copolymer of N-vinyl caprolactam and 2-acrylamido-2-methylpropanesulfonate sodium) accounting for 10%, surfactant Ethylene glycol monobutyl ether accounts for 30%, defoamer isobutanol accounts for 2%, corrosion inhibitor imidazoline quaternary ammonium salt accounts for 2%, organic solvent ethylene glycol accounts for 56%. The cloud point of the inhibitor was 78°C (1% by mass sample dissolved in 1% by mass saline). The experimental conditions and results are shown in Table 2.

Embodiment 2

[0024] The selected sulfur-containing natural gas hydrate inhibitor is composed of: kinetic inhibitor (binary copolymer of N-vinyl caprolactam and 2-acrylamido-2-methylpropanesulfonate sodium) accounting for 30%, surfactant Ethylene glycol monobutyl ether accounts for 30%, defoamer isobutanol accounts for 2%, corrosion inhibitor imidazoline quaternary ammonium salt accounts for 2%, organic solvent ethylene glycol accounts for 36%. The cloud point was 82°C (1% by mass sample dissolved in 1% by mass saline). The experimental conditions and results are shown in Table 2.

Embodiment 3

[0026] The selected sulfur-containing natural gas hydrate inhibitor is composed of: kinetic inhibitor (binary copolymer of N-vinyl caprolactam and 2-acrylamido-2-methylpropanesulfonate sodium) accounting for 30%, surfactant Ethylene glycol monobutyl ether accounts for 30%, defoamer isobutanol accounts for 2%, corrosion inhibitor imidazoline quaternary ammonium salt accounts for 2%, and organic solvent methanol accounts for 36%. The cloud point was 80°C (1% by mass sample dissolved in 1% by mass saline). The experimental conditions and results are shown in Table 2.

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Abstract

The invention relates to a sulfur-containing natural gas hydrate inhibitor, which comprises the following ingredients in percentage by weight through being metered by the total weight percentage of 100 percent: 10 to 30 percent of dynamic hydrate inhibitors, 10 to 30 percent of surfactants, 2 to 5 percent of defoaming agents, 2 to 5 percent of corrosion inhibitors and 50 to 70 percent of organic solvents, wherein the dynamic hydrate inhibitors are N-vinylcaprolactam and 2-allylformamide-2-methyl sulfonate bipolymers with the weight-average molecular weight being 5000 to 20000 or N-vinyl pyrrolidone, N-vinylcaprolactam and 2-allylformamide-2-methyl sulfonate terpolymers with the weight-average molecular weight being 6000 to 30000. The hydrate inhibitor has a better inhibition effect on hydrates formed by high-content hydrogen sulfide natural gas and is applicable to the prevention of hydrate formation in a high-temperature and high-salt sulfur-containing natural gas integral conveying system, the blockage formation of the hydrates is prevented, and a good anti-corrosion effect is realized on the integral conveying pipeline and the ground equipment.

Description

technical field [0001] The invention relates to a natural gas hydrate inhibitor suitable for hydrate prevention in high-sulfur gas wells and gas production and transportation pipelines with high temperature and high salt content in water. Background technique [0002] Gas hydrate is an ice-like substance formed from water and natural gas components at low temperature and pressure. Once this hydrate is formed, it will cause serious blockage of gas production and transmission pipelines, stop production and cause extremely adverse effects on natural gas production. In the process of high-sulfur natural gas extraction, gathering and transportation, due to the high temperature of natural gas hydrate formation, it is more likely to encounter the problem of hydrate blockage. [0003] Adding hydrate inhibitors is one of the most common methods to prevent hydrate blockage in downhole and surface gas well equipment and natural gas gathering and transportation pipelines at home and ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/524
Inventor 金洪周厚安康志勤刘友权任宇石晓松
Owner PETROCHINA CO LTD
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